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17 Appendix
17.1 Analog value representation (analog input modules)
The analog values can either be represented with16 bit or 12 bit. The two's-complement represen-
tation allow the representation of positive as well as negative values. The bits marked with an ”X”
are not relevant for the analog value representation.
16-bit representation
The 16-bit-representation is realized as a two's-complement: 2 byte of process data are completely
occupied:
12-bit representation
In the voltage measurement/ output and in the temperature measurement, the value is represented
as a two's-complement. In the current measurement/ output and in the resistance measurement,
the value is represented as a number. The 12 bit value is left-justified and occupies bit 15 to 4 of the
process data:
The diagnostic data is integrated in the process input data and occupies 4 bit (right-justified).
Fig. 330: 16-bit representation
Fig. 331: 12-bit representation
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